If you want your objects within a specific boundary, make 4 stones (or trees or whatever) and place them in the corners of where you would like your boundary. Then select them all and do the scatter objects. They will be more or less contained within the "square" that you created. Of course, it doesn't have to be square :). Thank Varian for that one...at least I THINK it was Varian that told how to do this ;). Laurie